<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头部图标 -->
      <div class="avatar_box">
        <!-- <img src="../assets/logo.png" alt="" /> -->
      </div>
      <!-- 用户登录表单 -->
      <!-- 这里loginFormRef是引用对象，rules是验证规则 -->
      <el-form
        ref="loginFormRef"
        label-width="0px"
        :model="loginForm"
        :rules="loginFormRules"
        class="login_form"
      >
        <!-- user name -->
        <el-form-item prop="username">
          <el-input
            prefix-icon="iconfont icon-yonghuguanli"
            v-model="loginForm.username"
          ></el-input>
        </el-form-item>
        <!-- user password -->
        <el-form-item prop="password">
          <el-input
            prefix-icon="iconfont icon-mima"
            v-model="loginForm.password"
            type="password"
            show-password
          ></el-input>
        </el-form-item>
        <!-- button -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>
<script>
import { login, getUserInfo } from '@/api'
import { mapMutations } from 'vuex'
export default {
  data() {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 这是表单验证规则对象
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入用户名称', trigger: 'blur' },
          { min: 2, max: 6, message: '长度在 2 到 6个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          {
            min: 4,
            max: 10,
            message: '长度在 4 到 10 个字符',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  methods: {
    ...mapMutations('user', {
      USER_LOGIN: 'USER_LOGIN'
    }),
    // 对整个表单进行重置，将所有字段值重置为初始值并移除校验结果
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields()
    },
    // 实现登录表单数据登录前的预验证
    login() {
      this.$refs.loginFormRef.validate(async val => {
        if (!val) {return false}
        let ret = null
        if (process.env.NODE_ENV === 'mock') {
          ret = await login(this.loginForm)
        } else {
          ret = await this.$https('mock/token.json')
        }
        if (ret.code !== 200) {
          return this.$message.error('登录失败')
        }
        this.$message.success('登录成功')
        // 1.将登录成功之后的token，保存到客户端的sessionStorage中
        //  1.1项目中除了登录之外的其他api接口，必须在登录之后才能访问
        //  1.2token只应在当前网站打开期间生效，所以token保存在sessionStorage中
        window.sessionStorage.setItem('token', ret.data.access_token)
        let res = null
        if (process.env.NODE_ENV === 'mock') {
          res = await getUserInfo()
        } else {
          res = await this.$https('mock/userInfo.json')
        }

        // vuex存储用户信息
        if (res.code === 200) {
          this.USER_LOGIN(res.data)
        }
        // 2.通过编程式路由导航跳转到后台主页，路由地址是/home
        this.$router.push('/home')
      })
    }
  }
}
</script>
<style lang="scss" scoped>
.login_container {
  background: $--color-primary;
  height: 100%;
  .login_box {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 450px;
    height: 300px;
    border-radius: 3px;
    background: $--color-white;
    .avatar_box {
      width: 130px;
      height: 130px;
      padding: 10px;
      border: 1px solid $--color-eee;
      border-radius: 50%;
      box-shadow: 0 0 10px $--color-eee;
      background: $--color-white;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background: $--color-eee;
      }
    }
  }
}
.login_form {
  position: absolute;
  bottom: 0px;
  width: 100%;
  padding: 0 10px;
  box-sizing: border-box;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
